Apparatus for grinding the rolls of ore crushing or like mills



May 19, 1931. A. VOEGEL 1,306,225

APPARA'IUS FOR GRINDING THE ROLLS OF ORE GRUSHING 0R LIKE MILLS Filed March 29. 1929 Jn ventor AUCl/ST VO/FGEL Patented May 19, 1931 -UNITED STATES PATENT OFFICE AUGUST VOEGEL, OF MAGDEBURG, GERMANY, ASSIGNOR TO THE FIR-M FRIED. KRUPP GRUSONWERK AKTIENGESELLSCHAFT, 0F MAGDEBURG-BUCKAU, GERMANY APPARATUS FOR GRINDING THE ROLLS OF ORE GRUSHING 0R LIKE MILLS Application filed March 29, 1929, Serial No. 350,988, and in Germany April 2, 1928.

This invention )relates to apparatus for grinding the rolls of ore crushing or like mills wherein the grinding apparatus is mounted on the framework of the rolling mill itself. According to the invention the shaft of the grinding tool is arranged at right angles to the axis of the roll so that the front surface of the grinding tool is pre sented to the said roll and the driving motor together with the grinding tool are adapted to be movedboth in a parallel and in a transverse direction to the axis of the roll. The said parallel movement of the grinding tool is preferably effected automatically by the rotation of the roll under treatment.- The grinding tool may consist ofa disc that carries on its working surface, easily interchangeable abrasive bodies. It is preferable to mount the grinding tool on the driving shaft so that it is axially displaceable thereon and to provide means for eX- ample, a spring or the like, whereby it may be held firmly in its working or operative position. A grinding device, according to the invention, has the advantage that notwithstanding the scant space available for the transverse and parallel feed of the grinding tool, it may be easily and effectively manipulated and such manipulation is not in any way hindered by the framework'of the mill. A further advantage resides in the fact that the feed of the grinding tool parallel to the roll axis, may be effected by the roll to the ground, and that the grinding tool, even when the roll is out of truth, is always in contact with the roll, and is able, if necessary to give way or to yield to any obstruction.

In the accompanying drawings illustrating preferred embodiments of the invention:

Figure 1 shows diagrammatically a front view of an ore crushing mill, the mounting of the driving motor of the grinding tool being shown in cross section,

Figure 2 is a longitudinal section through the head portion of the grinding tool mount on an enlarged scale,

Figure 3 shows the grinding tool in its working position on an enlarged scale, and

Figure 4; is a front view of a modified construction of the devlce.

Referring to Figures 1, 2 and 3 the roll The grinding tool consists of the disc 3 (Figure 3) which, at its working surface is provided with abrasive bodies 3", the latter being fixed or secured thereto in an easily interchangeable manner. The driving motor 4 is mounted movably, on a stationary support 6 positioned parallel to the roll, and,

together with the grinding tool 8 may be moved along the support 6 by means of the operating spindle 7 This longitudinal displacement of the grinding tool is effected automatically by the rotation of the shaft 1 of the roll 1 by the power transmission means 19, 20. The transverse feed of the motor 4 and of the grinding tool 3 is effected in the usual manner by rotation of the handwheel 9 provided on the spindle 8.

The support 6 is preferably inclined to the horizontal and the grinding tool 3, even if the roll to be ground is out of truth, is arranged to remain in constant contact with the roll and is able to follow any irregularities in the roll. This is effected by mounting the tool 3 on a stub shaft 5' adapted, by means of the feather key 5" to rotate with the motor shaft 5 and to be capable of axial movement relatively thereto. A compression spring 11 is arranged between the housing 10 (Figure 2) of the motor 4 and the disc 3' carrying the abrasive bodies 3", which allows a yielding displacement of the disc 3 when theroll to be ground is out of truth or when it meets any slight obstruction, and which returns the disc 3 immediately into its working position when the obstruction or the like is passed.

One end of the spring 11 is seated in a cupshaped boss 12 of the motor housing 10 and its other end enters into a similarly shaped boss in the hood 18. The cylindrical wall 18 of the hood is guided in its longitudinal movement by the flange 17 engaging on the 

